58 lines
964 B
C
58 lines
964 B
C
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#ifndef __KERN_SYNC_SYNC_H__
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#define __KERN_SYNC_SYNC_H__
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#include <x86.h>
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#include <intr.h>
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#include <mmu.h>
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#include <assert.h>
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#include <atomic.h>
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#include <sched.h>
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static inline bool
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__intr_save(void) {
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if (read_eflags() & FL_IF) {
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intr_disable();
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return 1;
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}
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return 0;
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}
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static inline void
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__intr_restore(bool flag) {
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if (flag) {
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intr_enable();
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}
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}
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#define local_intr_save(x) do { x = __intr_save(); } while (0)
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#define local_intr_restore(x) __intr_restore(x);
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typedef volatile bool lock_t;
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static inline void
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lock_init(lock_t *lock) {
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*lock = 0;
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}
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static inline bool
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try_lock(lock_t *lock) {
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return !test_and_set_bit(0, lock);
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}
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static inline void
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lock(lock_t *lock) {
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while (!try_lock(lock)) {
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schedule();
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}
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}
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static inline void
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unlock(lock_t *lock) {
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if (!test_and_clear_bit(0, lock)) {
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panic("Unlock failed.\n");
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}
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}
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#endif /* !__KERN_SYNC_SYNC_H__ */
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